New member, first problems?

Hi all, First of all i wish all a great new year! and including health wealth and happiness!
I have been looking for a jukebox for a long time and finally decided to just do it, i have no previous knowledge of jukeboxes but i am an amateur musician and hi fi lover
I bought my first Jukebox an AMI Ti2 Woodbridge 2 weeks ago. it is not working and has a few problems and i am hoping that someone can assist me
I do have the manual
The record player unit is working, there is output from the needle cartridge, the 50 watt R-4359A amplifier is working.
The pre amp and credit unit are not working, if i understand the manual correctly then the pre amp (R4372) should get its power form the power amp it should be on the pins 8 and 9 of the connection socket but i get no reading on my multi meter. the actual pre amp looks in good shape.
The credit unit keeps on blowing the fuse and i must be honest i only want to get the sound working first and then i will sort out the credit unit.
I am not a qualified electrician but can use a multi meter and soldering iron, as soon as i get the jukebox working i will strip it and restore it as good as i can, are there any books on jukebox restoration? I checked on the internet without any great success.

There was a remote cable connected to the jukebox but the cable came of and the remote unit is not a AMI unit, it is a NSM, I would like to use it in the future but at the moment the unit is not connected but the cable is connected to the jukebox

All in all i am already a jukebox junkie after only a few weeks

Regards James Gold

Hi All,

I speak and read German,

Regards James

Hallo James

The preamplifier is actually supplied by the power amplifier. However, not on pins 8 and 9, but on pins 8 and 1.

The preamp can only work if a volume control is connected. He just needs a simple 10K - control for both channels. The volume control is not used as a potentiometer, but as a variable resistor (10K or more means minimum volume, 0 ohms means maximum volume). The internal volume control is connected via a 7-pin connector to the power amplifier. Only two wires are needed for the control, the remaining pins are free.

For the connection of a remote volume control, there are two possibilities. There are RoweAMI original remote control (volume control and cancel button) with a 7-pin plug which can be plugged directly to the power amplifier instead of the internal volume control. If you do not want to use the original remote control, it is possible to clamp a 10K potentiometer to the terminal strip on the rear panel. Of course, the internal poti is here to clamp off. At this point, a cancel - button can also be connected. The terminals are labeled accordingly.

The fuse in the credit unit (I think this is it, which blows) is only for the addition coils. Mostly the large add coil is burnt in this case. If the coil is discolored from yellow to brown, it must be rewound. This also applies to the other coils. For testing, you can rotate the wiper contact in the credit unit by hand to allow a selection.

Best regards - charly49

Hi charly49,

thanks for the info,

on the socket for the preamplifier on the 50 watt amp will i always get a reading or only when a volume control is connected

the volume control on the back plate of the jukebox is a dual poti in my manual it only calls for a single.

i tried a single 10k poti as a remote control but i now realise i should have disconnected the dual poti wired up to the back plate

i have run out of time this weekend i will give more info next week

If you have any ideas please let me know

Regards James



1 mal bearbeitet. Zuletzt am 12.01.14 12:27.

Hello James

Of course, the supply voltage must always be present on the socket for the preamp.

The volume control plug has to be plugged into the socket (to see on your picture) on the power amplifier. That needs also to be, if the volume control is connected to the terminal on the back. This cable makes the connection from the amplifier to the terminal. As long as this is not done (the plug is missing on your picture), no audio signal comes to the power amplifier.

You wrote that a dual poti is installed. This has five connecting wires (4 wires and shielding). The original pot has only two leads. Where are the remaining 3 wires connected? Is the cable that goes from the terminal to the amplifier, 2-pole or 5 pole? The power amplifier is prepared  to be operated with different pre amps. Some of them need a stereo poti. It can not be excluded that such is installed in your jukebox. To identify, pictures of the preamplifier board (edge connector), the volume control - plug, the volume control and the terminal would be helpful.

Best regards - charly49

Hello James,

Welcome to the forum.
Charly49 is correct, if you do not have the volume control fitted into the amplifier then you do not get any sound.

In the pre-amp chassis you may find the following pre-amps R-3788B (two wire control) and R-3805 (five wire screen, a split channel pre-amp). These numbers are etched into the copper work.

The amplifier volume plug is wired for a 5 wire screened control.

Regards
Alan

Alan Hood
ami-man
UK

Hi Charly49 and Alan
Over the weekend i made some progress but still not working
a, pre amp is R4372A board is R3788 but without an a or b
b, The cable that goes from the back plate poti to the amp has 5 wires but only the red and black are connected, pins 4 and 3
pin 7 is the earth or shield
c, The cable from the pre amp to the amp is ok.
d, there is defiantly no voltage from pin 1 and 8. Check the picture to see if i was on the correct plug ,i think so. I checked it when a record was playing and also with no record playing, no voltage and with the plug from the poti plugged in.
e, i took the amp out and checked the components on the the back for damage, wear, over heating and loose connections. All ok as far as i checked
f, when i put the amp back in i realised that the very first time that i took the plugs off the amp i posobly could have put the pre amp plug on the wrong way, i know that there are 2 small corners to prevent this but..........
g, i played my laptop through the amp and it was working ok. so i presume no damage.
h, pins 10 and 11 are the input to the amp they are active if you touch then when the record plays


1 photo attached will try to upload more

as usual i can only work again at the week end

Thanks for all the help so far

Regards James






2 mal bearbeitet. Zuletzt am 20.01.14 18:49.

Hello James,

You have got the incorrect connections for the volume control for a 2 wire hook up the 10k log control should go across pins 1 & 2.

Regards
Alan

Alan Hood
ami-man

Hello James

If I am not mistaken, you have connected the multimeter to pin 3 and 8. Pin 1 is the far left in the top row. The pin numbers should be engraved in the plug housing. The voltage on pins 1 and 8 should always be present when the amplifier is connected to the mains voltage.

If you are stuck with troubleshooting you should give away the amplifier (power amp, preamp and volume control cable) to a specialist for testing. If necessary, the expert will correct the connections.

Best regards - charly49

hi Charley 49, Alan

the story so far

i have now corrected the volume control hook up and also measuring the voltage on the correct pins , but still not working

I have now focused on the power supply following the 2 brown leads that come from the transformer to the central terminal strip i measured 55v ac. The 2 diodes and one of the resistors are defiantly broken. There is also a zener diode on this terminal but i cannot check if it is broken or not.

My plan for next weekend, get the parts, change the diodes and the resistor first and see if it works. if not then change the zener diodes well or should i just go ahead and change all.

the resistor definitely had signs of overheating and i could get no reading.

I think that this is then the present limit of my ability and i will have to get someone look at the amp and pre amp if this last action does not work.

I

hi Charley 49, Alan

the story so far

i have now corrected the volume control hook up and also measuring the voltage on the correct pins , but still not working

I have now focused on the power supply following the 2 brown leads that come from the transformer to the central terminal strip i measured 55v ac. The 2 diodes and one of the resistors are defiantly broken. There is also a zener diode on this terminal but i cannot check if it is broken or not.

My plan for next weekend, get the parts, change the diodes and the resistor first and see if it works. if not then change the zener diodes well or should i just go ahead and change all.

the resistor definitely had signs of overheating and i could get no reading.

I think that this is then the present limit of my ability and i will have to get someone look at the amp and pre amp if this last action does not work.

Regards and thanks again for all the info so far

James



2 mal bearbeitet. Zuletzt am 26.01.14 15:10.

Here 2 more photos

Regards James

hi Charley 49, Alan,

My appologies at getting back to zou only now!!!!

thanks for all the info regarding my amplifier problem from my ami ti2!!!

finaly got it fixed it was the problem with the 24v supply for the pre amp.
i found a guy approx 35kms away from me who has specialised in tube repairs he also replaced all my capacitors and i put in a new set of tubes. the poti was also broken for the volume replaced it as well

i still have to fix the credit unit and i have leave in a few weeks time so perhaps i will be asking for help again.

In The meantime i saw an ami juke box with all original working parts but with a new glass front so that you can see the records being played.

Normaly i am the sot of guy who would want to get the jukebox back to its original state but when i saw the conversion well.........

has anz bodz out there got any information on such a conversion. Picture attached

Regards and many thanks again

James

Hello James

I think this is a homemade conversion. If you like it, you can do something similar with your TI2 Woodbridge. The wood-like grille can be easily removed and be replaced by a glasspanel. This you can customize according to your imagination.

Best regards - charly49

Hello James,

I do not like the results of 1977 RI-2 featured in the picture that would have been a Fantasia or Canterbury.
I think that good graphics can transform a jukebox, but making a jukebox visable for the sake of it when the model was clearly not made that way.

Regards
Alan

Alan Hood
ami-man
UK

Ich bitte um Verzeihung, dass ich diesen alten Thread wieder ausgrabe, aber ich habe aktuell zumindest eines der genannten Probleme an der MM-5, die bei meiner Mutter steht. Auch diese Box ist mit der Kombination R-4359A + R-4571A ausgerüstet. Vor wenigen Tagen ist der bisherige Verstärker ausgefallen und muss erst einmal überholt werden. Da meine Mutter die Box jedoch über Weihnachten gerne nutzen würde, habe ich ihr meinen identischen Reserveverstärker eingebaut. Dieser funktioniert auf beiden Kanälen, wenn man testweise direkt ein Signal drauf gibt. Allerdings kann ich auf Pin 1 und 8 keine Betriebssspannung für den Preamp messen, daher kommt auch kein Ton wenn eine Platte läuft. Wo fange ich am Besten mit der Suche nach der fehlenden Versorgungsspannung an?

Wäre sehr dankbar für ein paar Tips...und meine Mutter auch! :)

Freundliche Grüße,
Roland

Keep On Rockin'...
Roland